
public interface BeatModelInterface 
{
	// method from Controller to Model 
	void initialize(); 
	void on(); 
	void off(); 
	void setBPM(int bpm);
	int getBPM();
	
	// Register Observer
	void registerObserver(BeatObserver observer);
	void removeObserver(BeatObserver observer);
	void registerObserver(BPMObserver observer);
	void removeObserver(BPMObserver observer);

}
